九天 - heavens or skies; this word already appeared in ancient China. It literally means *nine skies*, where 9 stands for nine directions of the world. Centre was known as "great sky" (鈞天), the east as "dark blue sky" (蒼天), west as "clear sky", south as "fire sky" (炎天), south as "mysterious (black) sky" (変天), north-west as "hidden sky" (幽天), south-west as "crimson sky" (朱天), and south-east as "sunny (yang) sky" (陽天). These directions were closely related to the ancient believes, but also the political map of China. Another theory explains that the 九天 stands for 9 elements that the earth revolves around, those were sun and moon, 5 elements (water, metal, earth, wood, fire), the "fixed" star (possibly the North Star).